Why did the first poem/ballad that Ben wrote have great success?

Franklin's first published ballad was a success because it's main idea related to a much discussed, current event.

I now took a fancy to poetry, and made some little pieces; my brother, thinking it might turn to account, encouraged me, and put me on composing occasional ballads. One was called The Lighthouse Tragedy, and contained an account of the drowning of Captain Worthilake, with his two daughters: the other was a sailor's song, on the taking of Teach (or Blackbeard) the pirate. They were wretched stuff, in the Grub-street-ballad style; and when they were printed he sent me about the town to sell them. The first sold wonderfully, the event being recent, having made a great noise.